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# 16.11: Lesson Thirty-five

Created by: CK-12

## More About -able and -ible

1. In the previous lesson you saw that stems that form nouns with <ation> take -able to form adjectives. In the Verb column list the verb from which each adjective is derived:

appreciate appreciable
calculate
communicate
demonstrate
equate
estimate
navigate
negotiate
penetrate
remediate
separate
venerate
anticipate
circulate
create
indicate
locate
translate

5. Do verbs that end in -ate take -ible or -able? _________

That gives us our second useful generalization: Verbs that end in <ate> take -able to form adjectives.

3. In the Verb column list the verb from which each adjective is derived:

classify classifiable
deniable
enviable
justify justifiable
leviable
magnify magnifiable
modify modifiable
multiply multipliable
notify notifiable
pity
rely
vary

Which do verbs that end in <y> take to form adjectives, -ible or -able ? -able

Notice that if a verb that ends in <y>, like deny, took -ible, the <y> to $<\text{i}>$ change would lead to $^*$deniible, which wouldn't work since we avoid <ii> in English. If we deleted one of the $<\text{i}>$'s, we'd get $^*$denible, which doesn't fit the pronunciation because it leaves one vowel sound unspelled. So -able must be the logical choice.

That gives us our third useful generalization: Verbs that end in <y> take -able to form adjectives.

## Categories:

1 , 2 , 3 , 4 , 5

## Date Created:

Feb 23, 2012

Apr 29, 2014
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